Organic el display device

ABSTRACT

An organic EL display device includes at least one light emitting unit that includes a first electrode, an organic film that includes a light emitting layer and is provided over the first electrode, and a second electrode that is provided over the organic film and transmits light from the light emitting layer, and an optical adjusting layer that covers the at least one light emitting unit. The optical adjusting layer in a first area that overlaps the at least one light emitting unit in a planar view and the optical adjusting layer in at least one second area that is adjacent to the first area are different from each other in at least one of a number of layers that the optical adjusting layer includes, a film thickness, and a refractive index.

CROSS-REFERENCE TO RELATED APPLICATION

The present application claims priority from Japanese applicationJP2016-244639 filed on Dec. 16, 2016, the content of which is herebyincorporated by reference into this application.

BACKGROUND OF THE INVENTION 1. Field of the Invention

One or more embodiments of the present invention relate to an organic ELdisplay device.

2. Description of the Related Art

In Japanese Patent Application Laid-Open No. 2011-155002, organic ELelement is disclosed where a reflecting layer, a first electrode, alight emitting layer, and a second electrode are laminated in thisorder, and further an optical adjusting layer is provided on the secondelectrode.

SUMMARY OF THE INVENTION

On an organic EL display device, generally, a light emitting layer isprovided in a planar form on a substrate. Thus, a luminance in a frontdirection is relatively strong, and a luminance in an oblique directionis relatively weak. Therefore, there is a case where it is desired toincrease the luminance in the oblique direction and improveluminance/visual angle characteristics. Further, depending on a kind ofuse, there is a case where it is desired to decrease the luminance inthe oblique direction, and it is desired to increase or decrease theluminance in the front direction.

The present invention has been made in view of the above issue, and theobject thereof is to provide an organic EL display device with whichdesired luminance/visual angle characteristics can be obtained.

An organic EL display device includes at least one light emitting unitthat includes a first electrode, an organic film that includes a lightemitting layer and is provided over the first electrode, and a secondelectrode that is provided over the organic film and transmits lightfrom the light emitting layer, and an optical adjusting layer thatcovers the at least one light emitting unit. The optical adjusting layerin a first area that overlaps the at least one light emitting unit in aplanar view and the optical adjusting layer in at least one second areathat is adjacent to the first area are different from each other in atleast one of a number of layers that the optical adjusting layerincludes, a film thickness, and a refractive index.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a cross sectional diagram of an organic EL display deviceaccording to an embodiment of the present invention.

FIG. 2 is a diagram that illustrates an example of a cross sectionalstructure of an element layer.

FIG. 3 is a diagram that illustrates an example of a laminationstructure of a light emitting unit.

FIG. 4 is a diagram that illustrates an example of a planar structure ofthe element layer.

FIG. 5 is a diagram that illustrates a first embodiment of an opticaladjusting layer.

FIG. 6 is a diagram that illustrates a second embodiment of the opticaladjusting layer.

FIG. 7 is a diagram that illustrates a third embodiment of the opticaladjusting layer.

FIG. 8 is a diagram that illustrates a fourth embodiment of the opticaladjusting layer.

FIG. 9 is a diagram that illustrates a fifth embodiment of the opticaladjusting layer.

FIG. 10 is a diagram that illustrates a sixth embodiment of the opticaladjusting layer.

FIG. 11 is a diagram that illustrates a first variation of the opticaladjusting layer.

FIG. 12 is a diagram that illustrates a second variation of the opticaladjusting layer.

DETAILED DESCRIPTION OF THE INVENTION

Below, the respective embodiments of the present invention are explainedwith reference to the accompanying drawings. Note that the disclosedembodiments are merely examples, and an appropriate variation that aperson skilled in the art can easily arrive at without departing fromthe spirit of the present invention is naturally included in the scopeof the present invention. Further, while the width, thickness, shape,and the like of each part in the drawings may be illustratedschematically as compared with the actual embodiments in order toclarify the explanation, these are merely examples, and aninterpretation of the present invention should not be limited thereto.Furthermore, in the specification and the respective drawings, the samereference symbols may be applied to elements similar to those that havealready been illustrated in another drawing, and a detailed explanationof such elements may be omitted as appropriate.

FIG. 1 is a cross sectional diagram of an organic EL(electroluminescence) display device according to an embodiment of thepresent invention. The organic EL display device has a first substrate10. On the first substrate 10, an integrated circuit chip 12 to drive apixel is mounted. To the first substrate 10, for an electric connectionto the outside, a flexible wiring substrate 14 is connected. On thefirst substrate 10, a circuit layer 16 is formed that includes a thinfilm transistor, a wiring, and an insulating layer that are notillustrated. On the circuit layer 16, an element layer 18 is laminated.The details of the element layer 18 will be described later.

The organic EL display device has a second substrate 20. The secondsubstrate 20 is disposed so as to be opposed to the first substrate 10with a space therebetween. A filler 22 is provided between the firstsubstrate 10 and the second substrate 20, and the filler 22 issurrounded and sealed by the sealing member 24. It may be configuredthat the second substrate 20 is not provided. Further, in the case wherethe second substrate 20 is provided if the second substrate 20 is fixedby the filler 22 or another means, it may be configured that the sealingmember 24 is not necessarily provided. Further, in the case where thesecond substrate 20 is not provided, it may be configured to not providethe sealing member 24.

In the explanation below, it is provided that a direction in which thesecond substrate 20 is opposed to the first substrate 10 (the directionof arrow F in FIG. 1) is an upper direction. In the present embodiment,an upper surface of the second substrate 20 is a display surface DS, anda front face of the display surface DS is faced in the upper direction.

FIG. 2 is a diagram that illustrates an example of a cross sectionalstructure of the element layer 18. In the figures that appear after thisfigure, in order to make it easy to see the cross sectional structure,hatchings of the circuit layer 16, a planarizing film 30, a bank 50, anda sealing film 90 are omitted.

The circuit layer 16 is covered by the planarizing film 30, and on theplanarizing film 30 a first electrode 40 is disposed. On the planarizingfilm 30 a through hole 30 a for connecting the first electrode 40 to athin film transistor of the circuit layer 16 is formed. The planarizingfilm 30 is formed of, for example, an organic insulating material suchas acrylic resin, and has a flat upper surface. The first electrode 40is, for example, an anode, and is formed of metal such as aluminum,silver, copper, nickel, and titanium.

The planarizing film 30 and the first electrode 40 are covered by thebank 50. On the bank 50, an opening 50 a is formed at the bottom ofwhich the first electrode 40 exists. The bank 50 is referred to also asa pixel separation film, a rib, a partition wall, and the like, and isformed of an organic material such as acrylic resin. On the firstelectrode 40 that exists at the bottom of the opening 50 a of the bank50, an organic film 60 is laminated.

The bank 50 and the organic film 60 are covered by a second electrode70. The second electrode 70 is, for example, a cathode, and is formed ofa transparent conductive material such as magnesium silver (MgAg),indium zinc oxide (IZO), and indium tin oxide (ITO).

The second electrode 70 is covered by an optical adjusting layer 80. Thedetails of the optical adjusting layer 80 will be described later. Theoptical adjusting layer 80 is covered by the sealing film 90. Thesealing film 90 is formed of an inorganic insulating material such assilicon oxide and silicon nitride, and is in contact with the filler 22and the sealing member 24 (see FIG. 1).

The first electrode 40, the organic film 60, and the second electrode 70constitute a light emitting unit 100. An area that the light emittingunit 100 exists is an area where the first electrode 40, the organicfilm 60, and the second electrode 70 are laminated, and specifically, itis an area inside the opening 50 a (or an innermost edge) of the bank 50in a planar view.

FIG. 3 is a diagram that illustrates an example of a laminationstructure of the light emitting unit 100. The light emitting unit 100 isprovided with the first electrode 40, a transparent electrode 42, theorganic film 60, and the second electrode 70 in order from bottom up.The organic film 60 is provided with a hole injection layer (HIL) 61, ahole transport layer (HTL) 62, an electron block layer (EBL) 63, a lightemitting layer (EML) 64, a hole block layer (HBL) 65, an electrontransport layer (ETL) 66, and an electron injection layer (EIL) 67 inorder from bottom up. This is merely an example, and a laminationstructure other than this one may be adopted. As long as the samedesired functions can be obtained, it is fine that some of the layers isomitted or replaced with another layer, and a plurality of layersstacked vertically are substituted by another single layer.

A known material is adopted as a material of each layer of the organicfilm 60. The lamination structure of the organic film 60 is not limitedto the above one, and it is sufficient if it includes at least the lightemitting layer 64. A color of light emitted by the light emitting layer64 is not limited to white, and may be another color such as red, green,and blue.

Light that is generated in the light emitting layer 64 and is directedupward penetrates the second electrode 70 and the optical adjustinglayer 80, and is directed toward the display surface DS (see FIG. 1).Whereas, light that is generated in the light emitting layer 64 and isdirected downward is reflected upward at a reflecting surface 401 of thefirst electrode 40, penetrates the second electrode 70 and the opticaladjusting layer 80, and is directed toward the display surface DS. Thelight emitting unit 100 has a resonator structure that amplifies lightwith a specific wavelength between the reflecting surface 401 of thefirst electrode 40 and the optical adjusting layer 80 or the secondelectrode 70.

FIG. 4 is a diagram that illustrates an example of a planar structure ofthe element layer 18. The light emitting unit 100 is provided for eachsubpixel. In the present embodiment, light emitting units 100R, 100G,and 100B of three colors, namely, red, green, and blue, for example areprovided. The light emitting units 100R, 100G, and 100B are, forexample, arranged so that they appear alternately in a predeterminedorder in at least one of a row direction and a column direction. It maybe configured that the colors of the subpixels are obtained by a colorfilter provided in the second substrate 20 (see FIG. 1). Further, thesize and the number of the subpixels may vary depending on their displaycolor. Also, their arrangement does not have to be a square arrangement,and may be a delta arrangement and a PenTile arrangement.

As illustrated in FIGS. 2 and 4, a number of layers in the opticaladjusting layer 80 in a first area A1 that overlaps the light emittingunit 100 in a planar view, and a number of layers in the opticaladjusting layer 80 in a second area A2 that is adjacent to the firstarea A1 are different from each other. Here, the first area A1 is anarea that includes the entire light emitting unit 100 in a planar view.The second area A2 is, for example, a peripheral area that surrounds thefirst area A1, but may have a form other than this, and may also be atleast a part of the peripheral area.

The optical adjusting layer 80 includes a first film 81 and a secondfilm 85 that overlap each other. The optical adjusting layer 80 includesthe first film 81 and the second film 85 in the second area A2, and theoptical adjusting layer 80 includes the first film 81 but does notinclude the second film 85 in the first area A1. The optical adjustinglayer 80 may be configured such that the first film 81 is on an upperside, and the second film 85 is on a lower side, and vice versa.

The second film 85 covers an upper surface of the bank 50, and has anopening 85 a that includes the entire opening 50 a of the bank 50 in aplanar view. Due to this configuration, the first area A1 includes onlythe first film 81, and the second area A2 includes both of the firstfilm 81 and the second film 85. That is, an area inside the opening 85 aof the second film 85 in a planar view is the first area A1, and thearea other than that area is the second area A2.

The first film 81 or the second film 85 may be formed of a conductivematerial, an inorganic material, and an organic material. The details ofa combination of materials of the first film 81 and the second film 85will be described later.

In a case they are formed of a conductive material, the first film 81 orthe second film 85 is formed of a transparent conductive material suchas magnesium silver (MgAg), indium zinc oxide (IZO), and indium tinoxide (ITO) as the second electrode 70, or a metal material such as Aland Ag. Their thicknesses are, for example, several nm to severalhundred nm.

In a case they are formed of an inorganic material, the first film 81 orthe second film 85 is formed of a fluoride (e.g., LiF, MgF₂, CaF₂, andBaF₂, etc.), a silicon oxide (e.g., SiO₂, etc.), or the like. Theirthicknesses are, for example, several tens nm to several hundred nm.

If formed of an organic material, the first film 81 or the second film85 is formed of a general organic material such as Alq3(Tris(8-hydroxyquinolinato)aluminium) and NPB(4,4′-Bis[N-(1-naphthyl)-N-phenylamino]biphenyl), or an organic materialthat is the same as a material of one of the layers 61 to 67 thatconstitute the organic film 60. Further, they may be formed of anorganic material whose refractive index is adjusted, also. Theirthicknesses are, for example, several tens nm to several hundred nm.

Note that the sealing film 90 that covers the optical adjusting layer 80is foiled of an inorganic material such as silicon oxide and siliconnitride, and its thickness is, for example, several hundred nm toseveral μm. The optical adjusting layer 80 is sufficiently thin ascompared with the sealing film 90.

On the organic EL display device of the present embodiment that isprovided with the optical adjusting layer 80 as described above, thenumber of layers in the optical adjusting layer 80 that light FL that isemitted from the light emitting unit 100 and travels in a frontdirection penetrates, and the number of layers in the optical adjustinglayer 80 that light TL that travels in an oblique direction penetratesare different from each other. Specifically, the light FL that travelsin the front direction penetrates the first film 81 only, and the lightTL that travels in the oblique direction penetrates both of the firstfilm 81 and the second film 85. Here, the light emitting unit 100 isfoiled inside the opening 50 a of the bank 50, the second film 85 coversthe upper surface of the bank 50, and the second film 85 is positionedhigher than the light emitting unit 100. Therefore, the light TL thattravels in the oblique direction which covers a relatively wide anglerange easily penetrates the two layers, the first film 81 and the secondfilm 85.

According to such a configuration, by adjusting film thicknesses andrefractive indices of the first film 81 and the second film 85, itbecomes possible to improve an extraction efficiency of the light TLthat travels in the oblique direction, and improve the luminance/visualangle characteristics. For example, if an adjustment is made such thatlight reflected downward at an interface between the sealing film 90 andthe second film 85 is reflected at an interface between the second film85 and the first film 81 to go upward again, the extraction efficiencyof the light TL that travels in the oblique direction improves. Further,if an adjustment is made to satisfy the conditions with which the lightthat is repeatedly reflected at the interfaces is strengthened likethis, the extraction efficiency of the light TL that travels in theoblique direction improves.

In a case where the extraction efficiency of the light TL that travelsin the oblique direction is improved, it is preferable that a refractiveindex of a film located on the lower side from among the first film 81and the second film 85 (in the example illustrated in FIG. 2, the firstfilm 81) is larger than that of a film located on the upper side (in theexample illustrated in FIG. 2, the second film 85). Further, it ispreferable that the refractive indices of the first film 81 and thesecond film 85 are larger than that of the second electrode 70.

Meanwhile, it is possible to intentionally lower the extractionefficiency of the light TL that travels in the oblique direction,depending on how to adjust the film thicknesses, the refractive indices,and the like of the first film 81 and the second film 85. According tothis, it is possible to prevent another person from peeping inobliquely.

Further, it is possible to both improve and lower the extractionefficiency of the light FL that travels in the front direction,depending on how to adjust the film thickness, the refractive index, andthe like of the first film 81. Therefore, by combining the improving orthe lowering of the extraction efficiency of the light TL that travelsin the oblique direction and the improving or the lowering of theextraction efficiency of the light FL that travels in the frontdirection, it is possible to have desired luminance/visual anglecharacteristics.

In the embodiment that has been described above, the number of layers inthe optical adjusting layer 80 in the first area A1 and the number oflayers in the optical adjusting layer 80 in the second area A2 aredifferent from each other. However, the configuration is not limited tothis, and even in a case where only one layer constitutes the opticaladjusting layer 80 as a whole, as long as at least one of the filmthickness and the refractive index at the first area A1 and that at thesecond area A2 are different from each other, the same effect can beobtained. For example, if an adjustment is made so as to satisfy theconditions with which the light that is repeatedly reflected in thesecond area A2 between the upper surface and the lower surface of theoptical adjusting layer 80 is intensified, the extraction efficiency ofthe light TL that travels in the oblique direction improves.

Here, a supplementary explanation is given as to functions and roles ofthe optical adjusting layer 80.

Firstly, a case is considered where the optical adjusting layer isconstituted by only one layer (only a CAP1). In the normal configurationin which the optical adjusting layer is not given, for example, in aconfiguration where cathode metal (the second electrode 70), aninorganic passivation (the sealing film 90), resin (the filler 22) arelaminated in order from bottom up, generally, the refractive index ofthe inorganic passivation is the largest one, and the refractive indexof the resin is the second largest one, and the refractive index of thecathode metal is the smallest one. The refractive indices of the cathodemetal/the inorganic passivation/the resin with respect to the wavelengthof 550 nm are, for example, around 0.17/1.8/1.5.

Here, an optical adjusting layer (e.g., an organic film) with therefractive index higher than that of the inorganic passivation isinserted between the cathode metal and the inorganic passivation. If therefractive index of the optical adjusting layer with respect to thewavelength of 550 nm is, for example, 2.0, the refractive indices of thecathode metal/the optical adjusting layer/the inorganic passivation/theresin with respect to the wavelength of 550 nm becomes, for example,around 0.17/2.0/1.8/1.5. In this configuration, as compared with thenormal configuration as above, the difference between the refractiveindex of the cathode metal and the refractive index of the layers overit becomes large. Therefore, the light that returns to the anode sidefrom the cathode metal (transmission light) decreases, and as a result,the extraction efficiency of the light improves.

Next, a case is considered where the optical adjusting layer includestwo layers (CAP1+CAP2). In addition to the configuration where theoptical adjusting layer described above is constituted by only one layer(only the first optical adjusting layer), a second optical adjustinglayer (e.g., an inorganic film) with the refractive index lower thanthat of the two is inserted between the first optical adjusting layerand the inorganic passivation. If the refractive index of the secondoptical adjusting layer with respect to the wavelength of 550 nm is, forexample, 1.36, the refractive indices of the cathode metal/the firstoptical adjusting layer/the second optical adjusting layer/the inorganicpassivation/the resin with respect to the wavelength of 550 nm become,for example, around 0.17/2.0/1.36/1.8/1.5. In this configuration, thereare relatively large differences in the refractive indices between thefirst optical adjusting layer and the second optical adjusting layer,and between the second optical adjusting layer and the inorganicpassivation.

Accordingly, in addition to the decrease of the light that returns tothe anode side from the cathode metal as described above, a multipleoptical interference effect is strengthened, and thus an improve of theextraction efficiency of the light can be expected, as compared with thecase where the optical adjusting layer is constituted by only one layer.Therefore, if there is the optical adjusting layer constituted by onelayer, the extraction efficiency is higher than that in a case wherethere is no optical adjusting layer, and if there is the opticaladjusting layer constituted by two layers, the extraction efficiency ishigher than that in a case where there is the optical adjusting layerconstituted by one layer.

In the embodiment described above, the balance of the light intensity inthe front direction and the light intensity in the oblique direction,for example, are adjusted, by making use of the difference in theextraction efficiency of the light caused by the difference in thenumber of layers in the optical adjusting layer as above.

Below, an example of a combination of materials of the first film 81 andthe second film 85 is explained. A detailed explanation is omitted byapplying the same reference symbol for an element that is the same asthe one in the configuration as above.

FIG. 5 is a diagram that illustrates a first embodiment of the opticaladjusting layer 80. In this example, a second film 85 c that has theopening 85 a and is formed of a conductive material is disposed on thelower side, and the first film 81 y formed of an organic material isdisposed on the upper side. Here, the second film 85 c disposed on thelower side is provided so as to be in contact with the second electrode70 that covers the upper side of the bank 50. Therefore, it is possibleto decrease the wiring resistance of the second electrode 70.

FIG. 6 is a diagram that illustrates a second embodiment of the opticaladjusting layer 80. In this example, the first film 81 y formed of anorganic material is disposed on the lower side, and the second film 85 cthat has the opening 85 a and is formed of a conductive material isdisposed on the upper side. Here, the second film 85 c that is disposedon the upper side is provided on the first film 81 y formed of theorganic material and is not in contact with the second electrode 70.Thus it is in a floating state electrically.

FIG. 7 is a diagram that illustrates a third embodiment of the opticaladjusting layer 80. In this example, the first film 81 m formed of aninorganic material is disposed on the lower side, and the second film 85y that has the opening 85 a and is formed of an organic material isdisposed on the upper side.

FIG. 8 is a diagram that illustrates a fourth embodiment of the opticaladjusting layer 80. In this example, the first film 81 y formed of anorganic material is disposed on the lower side, and the second film 85 mthat has the opening 85 a and is formed of an inorganic material isdisposed on the upper side.

FIG. 9 is a diagram that illustrates a fifth embodiment of the opticaladjusting layer 80. In this example, the second film 85 m that has theopening 85 a and is formed of an inorganic material is disposed on thelower side, and the first film 81 y formed of an organic material isdisposed on the upper side.

FIG. 10 is a diagram that illustrates a sixth embodiment of the opticaladjusting layer 80. In this example, the second film 85 y that has theopening 85 a and is formed of an organic material is disposed on thelower side, and the first film 81 m formed of an inorganic material isdisposed on the upper side.

FIG. 11 is a diagram that illustrates a first variation of the opticaladjusting layer 80. In this example, contrary to the embodimentsdescribed above, the optical adjusting layer 80 includes the first film81 and the second film 86 in the first area A1, and the opticaladjusting layer 80 includes the first film 81 but does not include thesecond film 86 in the second area A2. The second film 86 is formed so asto fill the opening 50 a of the bank 50 and covers the light emittingunit 100.

Due to this configuration, the number of layers in the optical adjustinglayer 80 that the light emitted from the light emitting unit 100 in thefront direction penetrates and the number of layers in the opticaladjusting layer 80 that the light that travels in the oblique directionpenetrates are different from each other. Thus it is possible to bothimprove and lower the extraction efficiency of the light that travels inthe oblique direction, and it is also possible to both improve and lowerthe extraction efficiency of the light that travels in the frontdirection.

FIG. 12 is a diagram that illustrates a second variation of the opticaladjusting layer 80. As in this example, the regions in the second areasA2 that respectively correspond to the light emitting units 100R, 1000,and 100B of the respective colors might be different from one another inat least one of the number of layers, the film thickness, and therefractive index.

Specifically, in this example, in the second area A2, the film thicknessof an area AB2 that corresponds to the blue light emitting unit 100B isdifferent from that of the other areas. The area AB2 is a peripheralarea that surrounds the first area A1 that corresponds to the blue lightemitting unit 100B, but the configuration is not limited to this one,and the area AB2 may be at least a part of the peripheral area. Further,in at least one of the number of layers and the refractive index, thearea AB2 may be different from that of the other areas.

Due to this, in the second area A2, in the areas that respectivelycorrespond to the light emitting units 100R, 1000, and 100B of therespective colors, the film thickness, the refractive index, and thelike can be adjusted in accordance with the wavelength of the light thatpenetrates them. For example, in the second area A2, the film thickness,the refractive index, and the like of the area AB2 that corresponds tothe blue light emitting unit 100B can be adjusted so that they areappropriate for the wavelength of the blue light, and the filmthickness, the refractive index, and the like of the other areas can beadjusted so that they are appropriate for the wavelengths of the redlight and green light.

While there have been described what are at present considered to becertain embodiments of the invention, it will be understood that variousmodifications may be made thereto, and it is intended that the appendedclaims cover all such modifications as fall within the true spirit andscope of the invention.

What is claimed is:
 1. An organic EL display device comprising: at leastone light emitting unit that comprises a first electrode that includes areflecting surface, an organic film that comprises a light emittinglayer and is provided over the first electrode, and a second electrodethat is provided over the organic film and transmits light from thelight emitting layer; a bank on which a first opening is formed at abottom of which the first electrode exists, and which includes theorganic film inside the first opening; and an optical adjusting layerthat is provided over the second electrode, wherein a region where thefirst electrode, the bank, the organic film, the second electrode andthe optical adjusting layer are arranged in this order is formed, andthe optical adjusting layer is in a first area and at least one secondarea, the first area overlaps the first opening and an edge of the bankin a planar view, the at least one second area is surrounded by thefirst area without overlapping the first area in a planar view, theoptical adjusting layer in the first area is thinner than the opticaladjusting layer in the at least one second area, and the opticaladjusting layer in the first area and the optical adjusting layer in theat least one second area are different from each other in at least oneof a number of layers or a refractive index, wherein the opticaladjusting layer comprises a first film and a second film that overlapsthe first film in one of the first area and the at least one secondarea, the optical adjusting layer comprises the first film but does notcomprise the second film in the other one of the first area and the atleast one second area, wherein the second film of the optical adjustinglayer covers an upper surface of the bank, and on the second film asecond opening is formed which entirely includes the first opening in aplanar view, and wherein light emitted from the light emitting unit andthat travels in an orthogonal direction to a surface of the at least onelight emitting unit penetrates the first film, and light emitted fromthe light emitting unit and that travels in an oblique direction to thesurface of the light emitting unit penetrates both the first film andthe second film.
 2. The organic EL display device according to claim 1,wherein one of the first film and the second film that is disposed on alower side has a refractive index larger than that of the other one thatis disposed on an upper side.
 3. The organic EL display device accordingto claim 1, wherein a refractivity of the optical adjusting layer islarger than that of the second electrode.
 4. The organic EL displaydevice according to claim 1, wherein the second electrode covers anupper surface of the bank, and the second film of the optical adjustinglayer is formed of a conductive material and is provided so as to be incontact with the second electrode.
 5. The organic EL display deviceaccording to claim 1, wherein the at least one light emitting unitcomprises a plurality of light emitting units that emit lights of colorsthat are different from one another, and the at least one second areacomprises a plurality of second areas that respectively correspond tothe plurality of light emitting units, and the plurality of second areasare different from one another in at least one of a number of layersthat each second area has, a film thickness, and a refractive index. 6.The organic EL display device according to claim 1, further comprising:a sealing film that covers the optical adjusting layer.